含多層軟弱夾層的順層邊坡漸進(jìn)失穩(wěn)判定及局部破壞范圍研究
[Abstract]:In recent years, with the construction of a large number of railways and highways to the west of China, it is inevitable that there are a large number of bedding cutting slopes, especially when there are many layers of soft interlayers in the bedding slopes. After excavation, the staggered deformation between different rock layers in the bedding slope produces complex stress and strain state on the soft interlayer. How to evaluate and strengthen the stability of the bedding slope with multi-layer soft intercalation becomes the key point in the slope engineering. However, the current research on this area is less. Therefore, through theoretical analysis, numerical simulation, mathematical statistics and other research means and methods, this paper studies the determination method of progressive instability and local failure range of bedding slope with multi-layer weak intercalation. The method of judging the stability and stability of the bedding slope with multi-layer soft intercalation is obtained, and the calculation method and steps of the local failure range of the bedding slope with multi-layer weak intercalation are presented. The main research contents are as follows: (1) the progressive failure characteristics of weak intercalation are analyzed, and the stress and deformation characteristics of bedding slope with multi-layer weak intercalation are analyzed by using FLAC3D. Therefore, the progressive failure mechanism of bedding slope with multi-layer soft intercalation is abstracted. (2) considering the influence of strain softening characteristics of soft intercalation on the stability of bedding slope, based on the upper limit theory of plastic limit analysis, The overall stability and overall instability of the bedding slope with multi-layer weak intercalation are deduced. (3) the numerical model of bedding slope with multi-layer soft intercalation and its fish function are established by using discrete element software (UDEC). The parameter weakening of soft interlayer is realized in the failure process of bedding slope, and the gradual failure process of bedding slope with multi-layer soft interlayer is reappeared. The local failure range of bedding slope is determined as the inflection point of slope body monitoring displacement. (4) based on the progressive failure mechanism of bedding slope with multiple layers of weak intercalation, the relationship between the parameters of bedding slope and the value of local failure range is established. The regression analysis of each parameter and the value of local failure range is carried out by means of mathematical statistical analysis. Based on the theoretical formula of local failure range of bedding slope with single layer weak intercalation, (5) based on the theoretical formula of local failure range of bedding slope with single layer weak intercalation, The failure forms of bedding slope with multi-layer weak intercalation are classified, and the calculation formulas and steps of local failure range of bedding slope with multi-layer weak intercalation are established for different failure forms.
【學(xué)位授予單位】:西南石油大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類(lèi)號(hào)】:U416.14;U213.13
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